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Updated: Jun 19, 2026
Isolation of Cortical Microglia with Preserved Immunophenotype and Functionality From Murine Neonates
Published on: January 30, 2014
The aging mouse CNS is protected by an autophagy-dependent microglia population promoted by IL-34
Rasmus Berglund1, Yufei Cheng2, Eliane Piket2
1Department of Clinical Neuroscience, Division of Neuro, Karolinska Institutet, Center for Molecular Medicine, Karolinska University Hospital, 171 76, Stockholm, Sweden. rasmus.berglund@ki.se.
Abstract:
Microglia harness an unutilized health-promoting potential in age-related neurodegenerative and neuroinflammatory diseases, conditions like progressive multiple sclerosis (MS). Our research unveils an microglia population emerging in the cortical brain regions of aging mice, marked by ERK1/2, Akt, and AMPK phosphorylation patterns and a transcriptome indicative of activated autophagy - a process critical for cellular adaptability. By deleting the core autophagy gene Ulk1 in microglia, we reduce this population in the central nervous system of aged mice. Notably, this population is found dependent on IL-34, rather than CSF1, although both are ligands for CSF1R. When aging mice are exposed to autoimmune neuroinflammation, the loss of autophagy-dependent microglia leads to neural and glial cell death and increased mortality. Conversely, microglial expansion mediated by IL-34 exhibits a protective effect. These findings shed light on an autophagy-dependent neuroprotective microglia population as a potential target for treating age-related neuroinflammatory conditions, including progressive MS.
Insights
Researchers discovered a neuroprotective microglia population in aging brains that relies on autophagy and IL-34. Enhancing this population may treat neuroinflammatory diseases like multiple sclerosis (MS).
Area of Science:
- Neuroscience
- Immunology
- Cellular Biology
Background:
- Microglia, the brain's immune cells, possess untapped potential for combating age-related neurodegenerative and neuroinflammatory diseases, such as progressive multiple sclerosis (MS).
- Identifying specific microglial subtypes and their functions is crucial for developing targeted therapies.
Purpose of the Study:
- To investigate a specific population of microglia in aging brains and determine its role in neuroinflammation and neuroprotection.
- To elucidate the molecular mechanisms, including autophagy and cytokine signaling, regulating this microglia population.
Main Methods:
- Analysis of microglial populations in aging mouse brains using phosphorylation patterns (ERK1/2, Akt, AMPK) and transcriptomics.
- Genetic deletion of the autophagy gene Ulk1 in microglia.
- Investigating the role of IL-34 and CSF1 signaling via CSF1R.
- Inducing autoimmune neuroinflammation in aging mice to assess the impact of microglial modulation.
Main Results:
- A distinct microglia population characterized by activated autophagy markers was identified in aging mouse cortex.
- Deletion of Ulk1 in microglia reduced this population, while IL-34, not CSF1, was found to be essential for its maintenance.
- Loss of autophagy-dependent microglia exacerbated neural and glial cell death and increased mortality during induced neuroinflammation.
- IL-34-mediated expansion of microglia demonstrated a protective effect against neuroinflammation.
Conclusions:
- An autophagy-dependent, IL-34-regulated microglia population exhibits neuroprotective functions in aging and neuroinflammatory conditions.
- This specific microglial population represents a promising therapeutic target for age-related neuroinflammatory diseases, including progressive MS.
